Please see Computing Services' blog post for more details
If an LDAP group description has changed you may want to update all references to this in the database (e.g. change 'Staff in Web Services' to 'Staff in Digital Marketing & Communications').
You need to do this in 2 tables and (possibly) in lowercase as well.
Check the tables to see what form the group description exists in:
Update the tables:
- Log in to the wiki as Admin and flush the cache.